§ 1065.205 - Performance specifications for measurement instruments.

§ 1065.205 Performance specifications for measurement instruments.

Cross Reference

Link to an amendment published at 86 FR 34534, June 29, 2021.

Your test system as a whole must meet all the calibrations, verifications, and test-validation criteria specified outside elsewhere in this section part for laboratory testing or field testing, as applicable. We recommend that your instruments meet the specifications in Table 1 of this section for all ranges you use for testing. We also recommend that you keep any documentation you receive from instrument manufacturers showing that your instruments meet the specifications in Table 1 of this section.

Table 1 of § 1065.205 - Recommended Performance Specifications for Measurement Instruments

Measurement instrument Measured quantity symbol Complete system rise time (t_10-90) and fall time (t_90-10)^a Recording update frequency Accuracy^b Repeatability^b Noise^b Engine speed transducer f_n 1 s1 Hz means2% of pt. or 0.5% of max1% of pt. or 0.25% of max0.05% of max. Engine torque transducer T 1 s1 Hz means2% of pt. or 1% of max1% of pt. or 0.5% of max0.05% of max. Electrical work (active-power meter) W 1 s1 Hz means2% of pt. or 0.5% of max1% of pt. or 0.25% of max0.05% of max. General pressure transducer (not a part of another instrument) p 5 s1 Hz2% of pt. or 1% of max1% of pt. or 0.5% of max0.1% of max. Atmospheric pressure meter for PM-stabilization and balance environments p_atmos 50 s5 times per hour50 Pa25 Pa5 Pa General purpose atmospheric pressure meter p_atmos 50 s5 times per hour250 Pa100Pa50 Pa Temperature sensor for PM-stabilization and balance environments T 50 s0.1 Hz0.25 K0.1 K0.1 K Other temperature sensor (not a part of another instrument) T 10 s0.5 Hz0.4% of pt. K or 0.2% of max K0.2% of pt. K or 0.1% of max K0.1% of max. Dewpoint sensor for intake air, PM-stabilization and balance environments T_dew 50 s0.1 Hz0.25 K0.1 K0.02 K Other dewpoint sensor T_dew 50 s0.1 Hz1 K0.5 K0.1 K Fuel flow meter^c (Fuel totalizer) ṁ 5 s ( - )1 Hz ( - )2% of pt. or 1.5% of max1% of pt. or 0.75% of max0.5% of max. Total diluted exhaust meter (CVS)^c (With heat exchanger before meter) ṅ 1 s (5 s)1 Hz means (1 Hz)2% of pt. or 1.5% of max1% of pt. or 0.75% of max1% of max. Dilution air, inlet air, exhaust, and sample flow meters^c ṅ 1 s1 Hz means of 5 Hz samples2.5% of pt. or 1.5% of max1.25% of pt. or 0.75% of max1% of max. Continuous gas analyzer x 5 s1 Hz2% of pt. or 2% of meas1% of pt. or 1% of meas1% of max. Batch gas analyzer x 2% of pt. or 2% of meas1% of pt. or 1% of meas1% of max. Gravimetric PM balance m_PM See § 1065.7900.5 µg Inertial PM balance m_PM 5 s1 Hz2% of pt. or 2% of meas1% of pt. or 1% of meas0.2% of max

^a The performance specifications identified in the table apply separately for rise time and fall time.

^b Accuracy, repeatability, and noise are all determined with the same collected data, as described in § 1065.305, and based on absolute values. “pt.” refers to the overall flow-weighted mean value expected at the standard; “max” refers to the peak value expected at the standard over any test interval, not the maximum of the instrument's range; “meas” refers to the actual flow-weighted mean measured over any test interval.

^c The procedure for accuracy, repeatability and noise measurement described in § 1065.305 may be modified for flow meters to allow noise to be measured at the lowest calibrated value instead of zero flow rate.

[79 FR 23759, Apr. 28, 2014

the following table:

[86 FR 34534, June 29, 2021]